Just thought I would throw this out there. Haven't really done much engine rebuilding since the flat head days, we have been using engine we purchased from Baker Racing for my grandsons racing....with much success I must say. I have a bunch of animal parts laying around I have collected over the last few years. I am wondering what piston to cylinder clearance and finish is used in an Jr alcohol animal? I'm going to build one just for fun I guess and see how it turns out. TIA